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AST Launch Vehicle AcousticsThe liftoff phase induces acoustic loading over a broad frequency range for a launch vehicle. These external acoustic environments are then used in the prediction of internal vibration responses of the vehicle and components which result in the qualification levels. Thus, predicting these liftoff acoustic (LOA) environments is critical to the design requirements of any launch vehicle. If there is a significant amount of uncertainty in the predictions or if acoustic mitigation options must be implemented, a subscale acoustic test is a feasible pre-launch test option to verify the LOA environments. The NASA Space Launch System (SLS) program initiated the Scale Model Acoustic Test (SMAT) to verify the predicted SLS LOA environments and to determine the acoustic reduction with an above deck water sound suppression system. The SMAT was conducted at Marshall Space Flight Center and the test article included a 5% scale SLS vehicle model, tower and Mobile Launcher. Acoustic and pressure data were measured by approximately 250 instruments. The SMAT liftoff acoustic results are presented, findings are discussed and a comparison is shown to the Ares I Scale Model Acoustic Test (ASMAT) results.
Document ID
20150021421
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
Houston, Janice
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Counter, D.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Giacomoni, D.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
November 19, 2015
Publication Date
October 27, 2015
Subject Category
Acoustics
Launch Vehicles And Launch Operations
Report/Patent Number
M15-4577
Meeting Information
Meeting: Aerospace Testing Seminar
Location: Los Angeles, CA
Country: United States
Start Date: October 27, 2015
End Date: October 29, 2015
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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